Design for multi-step mechanochromic luminescence property by enhancement of environmental sensitivity in a solid-state emissive boron complex

2020 ◽  
Vol 4 (6) ◽  
pp. 1781-1788 ◽  
Author(s):  
Satoru Saotome ◽  
Kazumasa Suenaga ◽  
Kazuo Tanaka ◽  
Yoshiki Chujo
Keyword(s):  
Solid State ◽  
Luminescence Property ◽  
Design Concept ◽  
Environmental Sensitivity ◽  
Crystalline Sample ◽  
Boron Complex ◽  
Mechanochromic Luminescence

The solid-state emissive boron complex with multi-step mechanochromic luminescence was designed. The crystalline sample showed gradual changes in luminescent color triggered by scratching. The design concept is illustrated.

Preparation and Luminescence Property of LaMgAl11O19

2012 ◽  
Vol 519 ◽  
pp. 224-227 ◽  
Author(s):  
Xin Min ◽  
Ming Hao Fang ◽  
Yan Gai Liu ◽  
Zhao Hui Huang
Keyword(s):  
Solid State ◽  
Luminescence Property ◽  
Broad Band ◽  
Emission Spectra ◽  
Synthesis Temperature ◽  
Solid State Lasers ◽  
Broad Band Emission ◽  
Band Emission ◽  
Air Atmosphere ◽  
Fluorescent Lamps

Lanthanum magnesium hexaaluminate (LaMgAl11O19, LMA) has attracted much interest as its widely used in solid state lasers, TV phosphors and fluorescent lamps. In this paper, LaMgAl11O19 ceramic was pressureless sintered at 1650 °C for 10 h in air atmosphere using LaMgAl11O19 powders prepared by solid-state reaction at 1500 °C for 4 h. The result indicated that the synthesis temperature of LaMgAl11O19 powders was about 1500 °C. The LMA ceramic sample was dense and had a microstructure of platelet-like gains. The excitation spectrum shows two wide bands with the peaks at about 254 nm and 265 nm by monitoring the strongest 362 nm emission, and the emission spectra is consisted of a broad band emission with their peaks near 362 nm with a half-width about 5 nm exciting with 265 nm wavelength.

scholarly journals Sequential halochromic/mechanochromic luminescence of pyridyl-substituted solid-state emissive dyes: thermally controlled stepwise recovery of the original emission color

CrystEngComm ◽  
2019 ◽  
Vol 21 (38) ◽  
pp. 5699-5706 ◽  
Author(s):  
Suguru Ito ◽  
Chika Nishimoto ◽  
Sayaka Nagai
Keyword(s):  
Solid State ◽  
Emission Color ◽  
In Series ◽  
Temperature Controlled ◽  
Mechanochromic Luminescence

A stepwise temperature-controlled emission-color switch has been achieved in a system that combines halochromic and mechanochromic luminescence in series.

scholarly journals Structure–mechanical property correlations in mechanochromic luminescent crystals of boron difluoride dibenzoylmethane derivatives

IUCrJ ◽  
2015 ◽  
Vol 2 (6) ◽  
pp. 611-619 ◽  
Author(s):  
Gamidi Rama Krishna ◽  
Ramesh Devarapalli ◽  
Rajesh Prusty ◽  
Tiandong Liu ◽  
Cassandra L. Fraser ◽  
...  
Keyword(s):  
Solid State ◽  
Mechanical Behaviour ◽  
Crystal Engineering ◽  
Mechanical Analysis ◽  
Slip Systems ◽  
Crystalline Materials ◽  
Organic Solid ◽  
Boron Difluoride ◽  
Deformation Tests ◽  
Mechanochromic Luminescence

The structure and mechanical properties of crystalline materials of three boron difluoride dibenzoylmethane (BF2dbm) derivatives were investigated to examine the correlation, if any, among mechanochromic luminescence (ML) behaviour, solid-state structure, and the mechanical behaviour of single crystals. Qualitative mechanical deformation tests show that the crystals of BF2dbm(tBu)2can be bent permanently, whereas those of BF2dbm(OMe)2exhibit an inhomogeneous shearing mode of deformation, and finally BF2dbmOMe crystals are brittle. Quantitative mechanical analysis by nanoindentation on the major facets of the crystals shows that BF2dbm(tBu)2is soft and compliant with low values of elastic modulus,E, and hardness,H, confirming its superior suceptibility for plastic deformation, which is attributed to the presence of a multitude of slip systems in the crystal structure. In contrast, both BF2dbm(OMe)2and BF2dbmOMe are considerably stiffer and harder with comparableEandH, which are rationalized through analysis of the structural attributes such as the intermolecular interactions, slip systems and their relative orientation with respect to the indentation direction. As expected from the qualitative mechanical behaviour, prominent ML was observed in BF2dbm(tBu)2, whereas BF2dbm(OMe)2exhibits only a moderate ML and BF2dbmOMe shows no detectable ML, all examined under identical conditions. These results confirm that the extent of ML in crystalline organic solid-state fluorophore materials can be correlated positively with the extent of plasticity (low recovery). In turn, they offer opportunities to design new and improved efficient ML materials using crystal engineering principles.

Aggregation-induced emission and reversible mechanochromic luminescence of carbazole-based triphenylacrylonitrile derivatives

RSC Advances ◽  
2016 ◽  
Vol 6 (39) ◽  
pp. 32697-32704 ◽  
Author(s):  
Yong Zhan ◽  
Peng Gong ◽  
Peng Yang ◽  
Zhe Jin ◽  
Ying Bao ◽  
...  
Keyword(s):  
Solid State ◽  
Organic Molecules ◽  
Stimuli Responsive ◽  
Responsive Materials ◽  
Aggregation Induced Emission ◽  
Π Interactions ◽  
Conjugated Organic Molecules ◽  
Mechanochromic Luminescence

Conjugated organic molecules exhibiting AIE are characterized by the strongly twisted conjugated skeleton, which could provide loose intermolecular stacking and weak π–π interactions in the solid state to generate stimuli-responsive materials.

scholarly journals A new zinc(II) supramolecular square: Synthesis, crystal structure, thermal behavior and luminescence

2015 ◽  
Vol 80 (10) ◽  
pp. 1289-1295
Author(s):  
Xiu-Yan Wang ◽  
Zhong-Yu Zhao ◽  
Qian Han ◽  
Miao Yu ◽  
De-Yu Kong
Keyword(s):  
Crystal Structure ◽  
Solid State ◽  
Thermal Behavior ◽  
Luminescence Property ◽  
Room Temperature ◽  
Hydrothermal Condition ◽  
Stacking Interactions ◽  
Triclinic Space Group ◽  
Four Corners ◽  
State Luminescence

A new square-shaped Zn(II) complex, namely, [Zn4(L)4(phen)4]?6H2O (1) (L = 2-hydroxynicotinate and phen = 1,10- phenanthroline), has been synthesized under hydrothermal condition. The crystal of 1 belongs to triclinic, space group P -1 with a = 10.773(2) ?, b = 12.641(3) ?, c = 13.573(3) ?, ? = 107.44(3)?, ? = 102.66(3)?, ? = 93.89(3)?, C72H56N12O18Zn4, Mr = 1638.77, V = 1702.8(6) ?3 , Z = 1, Dc = 1.598 g/cm3 , S = 1.045, ?(MoK?) = 1.475 mm-1 , F(000) = 836, R = 0.0472 and wR = 0.0919. In 1, four L ligands bridge four Zn(II) atoms to form a square-shaped structure, where four phen ligands are respectively located on four corners of the square. The ?-? stacking interactions extend the adjacent squares into a 1D supramolecular chain. The thermal behavior of 1 has been characterized. Moreover, its solid state luminescence property has been studied at room temperature.

H-aggregate triggered mechanochromic luminescence property of 7-(diethylamino)-coumarin-3-carbaldehyde oxime derivative

2020 ◽  
Vol 61 (17) ◽  
pp. 151797 ◽  
Author(s):  
Kaiming Zhang ◽  
Jun Shu ◽  
Junbo Li ◽  
Lei Meng ◽  
Yi Yang ◽  
...  
Keyword(s):  
Luminescence Property ◽  
Mechanochromic Luminescence
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